Dvdram Head Amplifier Lsi

The SM9103M is a Photodiode photoelectric cur-
rent-to-voltage conversion head amplier LSI for
optical disk pickups in DVDRAM/DVDROM equip-
ment. It sums the Photodiode current data signals and
then converts the signals to a differential signal for
output. The output tracking servo and focusing servo
signals are derived from built-in sum and difference
circuits, and the gain for these servo signals CAN be
adjusted using serial Interface controls. Each of the
signals from the Photodiodes used to generate DPD
(Differential Phase Detection) tracking servo signal,
is current-to-voltage converted and then also output.
It operates from a single 5 V supply, and is available
in 36-pin plastic SSOP packages. By Seiko NPC Corp.